Abstract: On the basis of field tectonic mapping and measurement of the water setting displacement, we concluded in this paper that the Xiangshan-Tianjingshan arc fracture zone experienced two different active stages in the Cretaceous, i. e. strongly compression in the beginning and left-lateral strike-slip with compression at the end. The time boundary and cause of transition were analyzed and discussed. The appearance and range of the seismic deformation zone of the 1709 south of Zhongwei M = 7¹/₂ earthquake is also described.

Key words: Ningxia, Xiangshan-Tianjingshan arc fracture zone, Seismic deformation zone, Neotectonics

摘要： 本文根据野外地质填图和水系位移测量结果,论述了香山-天景山弧形断裂带新生代有两个不同活动性质的阶段,即早期阶段的强烈挤压和晚期阶段的左旋走滑兼挤压。分析、讨论了不同活动阶段的时间界限和转变原因。指出了1709年中卫南7¹/₂级地震形变带的表现形式、延伸范围。

关键词: 宁夏, 香山-天景山弧形断裂, 地震形变带, 新生代活动